DS1985-F5+ Maxim Integrated Products, DS1985-F5+ Datasheet - Page 25

• Manufacturer Part Number: DS1985-F5+
• Description: IBUTTON 16KBit ADD-ONLY F5
• Manufacturer: Maxim Integrated Products
• Series: iButton®r

Specifications of DS1985-F5+

• Rohs Information: IButton RoHS Compliance Plan
• Memory Size: 2KB
• Memory Type: EPROM
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

NOTES:
1. All voltages are referenced to ground.
2. V
3. Input load is to ground.
4. An additional reset or communication sequence cannot begin until the reset high time has expired.
5. Read data setup time refers to the time the host must pull the 1-Wire bus low to read a bit. Data is
6. V
7. 30 nanocoulombs per 72 time slots @ 5.0V.
8. At V
9. Capacitance on the data pin could be 800 pF when power is first applied. If a 5k resistor is used to
10. Under certain low voltage conditions V
may not reproduce the correct memory contents. Therefore, under low voltage conditions, it is
recommended to set either the most significant bit or all five most significant bits of TA2 to 1.
Internal circuitry of the chip will force these five bits back to 0 before they are shifted in the address
counter and CRC generator.
guaranteed to be valid within 1 s of this falling edge and will remain valid for 14 s minimum. (15
s total from falling edge on 1-Wire bus.)
pull up the data line to V
normal communications.
guarantee a presence pulse.
PUP
IH
is a function of the external pullup resistor and V
CC
= external pullup voltage. If V
=5.0V with a 5k pullup to V
CC
, 5 s after power has been applied the parasite capacitance will not affect
PUP
CC
ILMAX
and a maximum time slot of 120 s.
is lower than 3.0V the first byte read (any read command)
25 of 26
may have to be reduced to as much as 0.5V to always
PUP
.